-LRB- CNN -RRB- -- The man suspected of trying to attack the Dutch royal family by crashing his car near their bus has died , Dutch police said Friday .

A car is pictured after crashing into the crowd waiting for the visit of the royal family in Apeldoorn .

The man , whose name was not released , had been seriously injured in the crash Thursday in the town of Apeldoorn , about 45 miles east of Amsterdam , police said . He died early Friday , police said .

He had been charged with trying to attack the royal family , authorities said . Were you there ? Send us your video , images

Police searched the man 's house but found no weapons , explosives , `` or any other clues that could lead to the involvement of other people , '' police said .

Five people , as well as the driver , were killed and 12 were wounded in the incident , which happened during the country 's annual Queen 's Day celebration , police said .

Crowds had lined the streets to see Queen Beatrix and her family ride by in an open-top bus during the Netherlands ' annual holiday . See who the Dutch royal family are ''

As the bus moved along , a black hatchback zoomed past it . The crowds were behind barriers off the road , but security officials and journalists , including many cameramen , were in the road as the car went by .

The car crashed into the low metal railing around a column on the side of the road . The vehicle appeared heavily damaged even before the crash , but the reason for that was unclear .

There was no one other than the driver in the car at the time , police spokeswoman Esther Naber said .

Members of the royal family saw the crash and gasped , then quickly sat down as the bus continued driving .

The attack caused outrage in the Netherlands , newspapers Friday widely expressing disbelief and suggesting the monarchy would have to change .

`` Queens Day will never be the same , '' the Trouw newspaper said . `` The Netherlands always has been proud of their no nonsense royal family . With this comes a Queen who not only cycles a bike , but also mixes with people without obvious security measurements . Is that still possible now the royal family has been the target of an attack ? ''

The Algemeen Dagblad newspaper agreed .

'' `` What is going to happen on the 30th of April next year ? And will we continue to see the members of the royal family cycling through the canals of Amsterdam or hunting for bargains in the Bijenkorf in The Hague ? ''

Queen 's Day is a national holiday in the Netherlands , the Netherlands Antilles , and Aruba . The tradition started in 1885 and celebrates the birthday of the queen .

Although Queen Beatrix 's birthday is January 31 , she officially celebrates her birthday April 30 , according to the Dutch government .

Queen 's Day is known for its free market all over the country , where anybody is allowed to sell things in the streets . Other activities include children 's games and musical performances .

The day is marked with the color orange all over the country as a reference to the colors of the royal family , who come from the House of Orange-Nassau .

Emmy Dexel contributed to this report .

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Incident happened during the Netherlands annual Queen 's Day celebration

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Car hit crowd near open-top bus carrying Queen Beatrix of Netherlands

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Police : No other clues that could lead to the involvement of other people

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Police : There was no one other than the driver in the car at the time